2 Answers

At the opposite side to the slide you should see 4 dimples, these should have screws in them, possibly behind a plastic cap.
Take these out, flip the cube onto its side, holding the sides, push (or kick or use the mallet) to get the end piece moving, (there is a dimple which locates into the side which makes this difficult)
Once one side is out, the middle bits should come out easily.
The front (slide part) is assembled the same way.

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To fix it yourself, you need to disassemble the buttons, which can be done with two screwdrivers one a thin slot type the other a Phillips. Here is the process: 1. On the other side of the white button unit is a screw. Remove it using a Phillips screwdriver.2. You'll now have a black housing with a white button held in by three white tabs. 3. Free the white button from the housing by pressing inwards on each of the three tabs with the slot type screwdriver. 4. You'll now have a black base, a spring and a white button. Pay attention to how the two black parts align to each other so you re-assemble it correctly.. 5. Pop the white button out of the upper black surround. Sand the circumference of the white button evenly until it slips easily in and out of the black surround. A little silicon spray is a good idea.6. Reassemble unit and check it has full movement (see photo below). 7.On the underside of the button unit a ramp shape should lineup with an opening in the bottom edge.8. Fit button unit back into upper seat leg, Fit lower seat leg aligning it to the back of the button unit so the push rod in the lower seat leg pushes on to the ramp on the button unit. Note the seat button will not come out and lock until the seat is fitted back on to the chassis pushing the rod up to push the button out to the lock position. Once you have fitted the back screw in you can use a large screw driver to push down the inside of the lower leg to check the white button pops out and locks. If you have any resistance dismantle again to check alignment and the condition of the interlocking teeth of the button and the outer rings. Sand of any burrs and use a little silicon grease. Reassemble and test again. Repeat operation to the other side if necessary. Buttons are not interchangeable so doing one side at a time avoids mixing them up. If the tabs on the white button are broken you can buy a new button unit as a part www.babycare.nl/bugaboo-cameleon-seat-frame-push-buttons-p-2664.html

I successfully fixed this issue today on a 2008 dash
stroller. first remove the handle, you will need to drill out the two rivets
with a 1/4" drill bit, but don't go too far, don't drill out the
plastic on the handle piece. unscrew the four brake cable clips. unscrew the
two screws securing the grey release clips. Prop stroller on the handle bar side
(put padding underneath so you don't mess up your work surface) and the rear
wheels. now get two small bladed screw drivers, you can gradually pry down the internal
plastic locking wedge on either side till it releases the front wheel section
which folds down. (on the left side which is likely functioning, you can just
pull the plastic circular piece down with your fingers, as the internal wire is
still connected)
Now grab some vise grips, lock onto the locking wedge and
remove the whole mechanism, also remove the foam inside with a screw driver
(this likely is what was supposed to keep the tension wire in place). Take the
locking wedge mechanism apart. ( you will need to push the steel pin out with a
small screw, it does not take a lot of force) Get a small nylon zip tie and
secure it around the shaft on the tension wire connecting end of the locking
wedge. (this will keep it from ever falling out(pulling through) again. This
part (the locking wedges) should have been made out of aluminum or stainless
steel and the issue would never occur. You will need to trim the catch end of
the zip tie and make sure that it can slide freely inside of the plastic
sleeve. now slide off the nylon zip tie and set it aside along with the spring.
Take the circular plastic piece (the 4" part inside
that is near the handle piece with slots in it) slide in the tension cable.
Slide the other end of the tension cable into the frame from the handle bar
side till you can reach the end from the front wheel side. Now slide on the tubular
plastic wedge housing and lock it in place to the frame (the detente underneath
the frame lines up with the bump on the tubular sleeve), then the spring, then
the small nylon zip tie, then the release wedge. Secure the zip tie onto the
release wedge shaft and aim the head of the zip tie down so it can slide
freely. Put some Vaseline or white lithium grease on the release wedge so it
slides well. If the release wedge binds up you will need trim the zip tie head
a bit more so it fits.
Next take the removed riveted posts and drill them out with
a sharp 1/8" drill bit about 3/8" deep. (Use vise grips to hold onto
these guys, as they will get hot, and make sure to use some oil while you drill
to keep things cooler. Slide down the plastic circularly plastic pieces (you
may need small screw driver to manipulate them down) so you can re-attach the
two grey release mechanism brackets.
Re-insert the two formerly riveted brackets through the
frame which will locate the handlebar properly. Get two small 1/4" sheet
metal screws. Put the black washer back on, apply firm pressure and screw in
the 1/4" sheet metal screws into the drilled out posts with a drill.
Re-attach the seat and you are good as new.
Note: The instructions may seem a little tricky, but you can
do it.

hi I think I could help I bought a bertini shuttle as well if you stand behind the pram on the right run your hand down the right side of the hood there is a push up lever there mine is grey ok you need to push the grey? lever but also on the left and right there is a black lever you must push up al together hope this helps good luck from debbie